class_docstr: Megatron BART pretraining
docstr: allows child classes to add kwargs to dataset building
docstr_tok: ["allows","child","classes","to","add","kwargs","to","dataset","building"]
code: def _build_train_valid_test_datasets_kwargs(self):
      """allows child classes to add kwargs to dataset building"""
      return dict(
          delete_mask_prob=self._cfg.data.get("delete_mask_prob", 0.0),
      )
  
file_path: NeMo/nemo/collections/nlp/models/language_modeling/megatron_bart_model.py
imports: from omegaconf.dictconfig import DictConfig
  from pytorch_lightning.trainer.trainer import Trainer
  from nemo.collections.nlp.models.language_modeling.megatron_t5_model import MegatronT5Model
label_desc: Use image node_id 4 for calling the MegatronBARTModel obj's underlying member method code with example usage: obj._build_train_valid_test_datasets_kwargs() and returns: dict